Rotary compressor



June 4, 1929. w. :E. SHORE 15,62

ROTARY COMPRESSOR F iled Jan. 10, 1927 Maia/"2.52m. 7 "f" Patented June4, 192 9.

"UNITED STATES PIJATENT errlca.

wnmarrn'snonn, or WEST nnw BRIGHTON, NEW YORK no'ramz comrnnssoa,

Application filed January 10, 1927. Serial No. 160,194.

vane comprising a rigid unit operating in' balanced and sealedarrangement in bothof said cylinders, said vanes rotating about changingaxes and maintaining constant contact with the cylinder surface, eachrotor supporting the vane in the adjacent cylinder so as to eliminatedestructive end thrust and maintaining constant contact of both ends ofthe vane with its cylinder wall. In the drawings, Figure 1 is alongitudinal mid-sectional view taken through the casing of my improveddouble cylinder pump, the rotor and impeller vane being shown inclevation.

' Figure 2 is a part cross sectional view through the pump on the line2-2 of Figure 1.

Figure 3 is a diagram illustrating the peculiar shape of the cylinderchambers and the path of movement of the impeller vanes.

In the construction of I the pump herein shown, the cylindercasing 1- isopen at one cent to the bearing end 3 is provided with a c lindricalrecess i concentric with the axis of the hearing. A rotor 5 rigidlysecured to the shaft 6 is provided with a cylindrical portion 4 7journalled in the recess 4. The main portion of the rotor arranged'eccentrically within the cylinder chamber engages the division wall 8which separates the intake from the discharge side and it is formed witha dia- 4 metrically arranged parallel faced slot 8 to receive theimpeller vane 10. Recesses 9 are arranged each side of the division wallcom? J municating with the eccentric-cylinder chamber.

The cylinder cavity is of a peculiar-formation, the transverse axis Athrough the centre of the division wall 8 being arranged in alignmentwith the axis ofthe rotor 5, the rotor axis bein offset laterally fromthe centre of the cylin or so that the periphery of the side and isprovided with a flange 2 and adjarotor engages the division wall at oneside but is spaced from the cylinder wall forming a crescent-shapedcylinder chamber.

a The diameter of the cylinder perpendicular to the transverse axis AAis greater than the diameter through said transverse axis and li thewalls are therefore eccentric each side of the transverse axis. Thiseccentricity is provided to accommodate the impeller vane 10.

This vane has a maximum length substantially equal to but a trifle lessthan the minimum diameter of the cylinder on the transverse axis A-A,'which as the rotor rotates, moves about a constantly changing axis.

The peculiarties of the construction of the cylinder arefully describedin my co-pcnding application, Serial No. 160,193 filed January 10,192?,for rotary compressors which illustrates the single cylinderconstruction. The present invention constitutes a double cylind erconstruction and a cylinder casing 11 similar to the casing 1 isprovided with a flange 12 which abuts the flange 2. Countersunk recesses2 and 12 are arranged in the abutting faces of the flanges 2 and 12 andwithin the recess thus formed is secured a ring 13 which forms apartition wall interposed between and engaging the adjacent inward endfaces of the rotor and closes the outer end of the cylinder chamber 1 inthe cylinder casing 1 and also the chamber 11' in the cylinder casing11.

A rotor 14 arranged within the cylinder chamber 11' is formed with anannular flange 15 which 'iournals in the partition ring-13 tocentralizeth'e rotor 14. The rotor 14 is arranged in diametricallyopposite eccentric relation to the rotor 5 and an impeller vane 16similar to the impeller vane 10 is slidable in the transverse slot 17therein.

The impeller vanes 10 and 16 are arranged in right angular relation toeach other and are rigidly connected together in a unitary structure bya disc 18, which forms a part thereof. This disc is free to oscillate inthe space inside of the inner flange 15 of the rotor 14.

It will be seen that in a pump constructed as described, the rotor 5propels the vane 10 in the cylinder chamber 1' and as it rotates itdraws in through the intake :2: and discharges from the discharge 11 Therotor 14 which has its transverse slot in which the impeller vane 16slides arranged at right angles to the impeller vane 10 su ports theimpeller vane 10 centrally in relation to the cylinder chamnating endthrust and the consequent wearthe vane and thus maintaining constantcontact with her 1', thus preventing the vane from throwing to eitherone side or the other and elimiof the cylinder and the end of thcylinder at both ends of the vane.

As the blades are integrally connected, the movement of the vane 10carries the vane 16 with it and the disc 18'carries the rotor 14 aroundwithin the cylinder 11. The vane 16 iscentralized in relation to itscylinder by the vane 10, consequently'each vane centralizes the otherand the action of centrifugal force is controlled.

It will be understood from this description that the working parts arereduced to the very minimum and there is no unnecessary loss in frictionin a high speed device, as each rotor functions in regard to the pumpingaction and also acts as a centralizer for the impeller vane of theadjacent cylinder.

In the drawings I have shown the rotor 14 provided with a cylindricalextension 19 similar to the extension 7 of the rotor 5 and a hearingshaft 20 is also shown but these may, if desired, be eliminated.

The diagrammatic illustration in Figure 3 shows the eccentric formationof the c linder walls in exaggerated form. It will seen on reference tothis dia ram that if a line CC.is drawn through t e lonigtudinal axis ofthe rotor 5 perpen icular to the line A-A and of the same length, theends of the line C-C-would extend beyond the circle X. It will benotedthat the centre B of the cylinder and the centre D of the rotor aretransversely in line and that a line drawn through said centres will bethe true diameter of the circle described about B but if the line iscaused to move about the centre D and must remain the same length, thenthe moment that the rotor rotates to swing the line A-A out of thevertical on account of the difference in centres between the cylinderand the rotor the ends of the line if retained in balanced arrangementat either side must extend beyond the cylinder circle, first inincreasing ratio which reaches the maximum when the line is in theposition CC. It then reduces and draws inwardly until it again mergesinto the true circle on the vertical axis A-A. The line (1-0 indicatesthe position of the centre line of the blade when said blade isperpendicular to the line that cuts both cylinder and rotor centre butother lines E-E and F-.-F are shown at 45-angles merely to illustratethe centre line of the blade at different points.

The pump thus described may be operated with the cylindersinter-connected to stage the compression, that is, the discharge fromone o linder may be connected with the intake of t e other or thecylinders can be operated independently.

()n account of the practically perfect balancing of the impeller vanes,friction and posite relation t wear from centrifugal force is overcomein a perfectly manner and a very efiicient pump is produced.

' It will be understood that the terms contact, constant contactl, orsimilar expressions in the foregoing specification and appended claimsdo not mean an actual metalto-metal contact between the ends of thevanes and the inner surfaces of the respective cylinders, but simplythat the ends of the vanes are so close to the surfaces of therespective cylinders as to effect a sealing or operating contact withsuch surfaces. Though in the specification and claims I have termed mydevice a compressor, it will be understood that its use does notnecessarily involve the build-' ing up of any particular degreeofpressure. In the expanding chamber a degree of vacuumis ordinarilypresent. The pressure at the outlet end of the device obviously dependsupon the conditions and may be greater than or equal to, or. less thanatmospheric pressure. The word com ressor as herein used is to be sounderstoodi I What I claim as my invention is:

1. A rotary compressor "comprising a pair of pump cylinders arranged ineccentric relation the one to the other each bein open at one end andhaving their open en s connected to ether, rotors eccentrically mountedin each of said cylinders in diametrically ope one to the other and eachhaving a transverse slot extending axiall therethrough, a ring securedbetween the ac jaeent ends of said cylinders and engaging the adjacentend faces of said rotors and closing the adjacent ends of each of thechambers formed between said rotors and their respeetive cylinders, anda pair of impeller vanes rigidly connected 1n ri htangular relation toeach other and slidalily arranged in the transverse slots in saidrotors, the adjacent edges of said vanes enga ing the opposite faces ofsaid ring, each 0% orting the impeller vane in the other rotor 1nconstant contact at both ends with its cylinder wall free from endthrust.

2. A rotary compressor, comprising a pair of cylinder casings each openat one end and secured together at their open ends with their axesotl'set, rotors formed of a pair of solid circular members mountedeccentrically in said cylinders and each having a transverse slotextending .axially therethrough, an annular flange secured between theends of said cylinders and engagin in constant contact with the endsurfaces 0 the solid circular end faces of said rotors and separatingthe chambers of said cylinders, and a pair of flat vanes rigidlyconnected and arranged at right angles to each other and slidablyengaging the walls of the slots in said rotors, the adjacent edges ofsaid vanes engaging the annular flange separating said rotors.

3. A rotary compressor, comprising a pair said rotors sup:

the other of cylinders each open at one end and having the 0 en endsconnected together with the cylin er axes ofiset, an annular flangesecured between said cylinders at their open ends, a rotor eccentricallyjournalled in one of said cylinders, a rotor journalled in said annularflange and supported eccentrically in the other cylinder, transverseslots extending diametrically through each of said rotors and presentingcontinuous parallel faces, and an impeller vane comprising a pair ofblades formed of a unitary block of material arranged at right angles toeach other and each having continuous parallel faces, one bladeextending into the transverse slot in one rotor and the other extendinginto the transverse slot in the other rotor and each having continuoussurface contact with the faces of the rotor slot, each of said rotorsoperating to sup ort the vane of the other rotor with its en s inconstant contact with the cylinder surface in the rotation of the rotor.

4. A rotary compressor, comprising a pair of cylinder casings eachhaving an intake chamber and a discharge chamber separated by a narrowportion of the cylinder Walls, said cylinders being arranged with saidintake and discharge chambers in diametrically opposite position andwith their axes oflset, an annular flange arranged between saidcylinders, a rotor eccentrically mounted in one cylinder having itsperiphery engaging the cylinder wall at the narrow portion separatingthe intake chamber from the discharge chamber, a rotor mounted in saidannular flange and eccentrically supported in cylinder to engage theportion dividin its ischargechamber from its intake cham er, thecylinder chambers between the respective rotors and cylinders beingseparated by said annular flange which engages the inward end faces ofsaid rotors, each of said rotors having diametrically arranged slotsextendin therethrough presenting continuous parallel surfaces, andanimpeller vane formed of a pair of flat bladesforming a unitary part of acentral disc, said vanes engaging the slots in said rotor in continuoussurface contact across the diameter of the rotor and extending in rightangular relation to each other and adapted to be supported each by theopposite rotor within their operating cylinders free from contact withtheir cylinder walls through centrifugal force.

5. A rotary compressor, comprising a pair of pum cylinders arranged ineccentric relation t e one to the other, each being open at one end andhaving their opened ends connected together, rotors eccentricallymounted in each of said 0 linders in diametrically opposite relation theone to the other and each having a transverse slot extendingtransversely through its axis, a pair of Impeller vanes rigidlyconnected in ri ht-angular relation to each other and slidal ly arrangedin the transverse slots in said rotors, and a ring secured between theadjacent ends of said cylinders and closing the adjacent ends of each ofthe chambers and their respective cylinders, the adjacent parallelsurfaces of said vanes engaging the opposite faces of said rin each ofsaid rotors supporting the impel er vane in the other rotor in constantcontact at both ends with its cylinder wall and free from destructiveend thrust there: against.

WILLIAM E. SHORE.

